# What does RAAP equal zero mean in protein arrays?

**URL:** <https://forum.depmap.org/t/what-does-raap-equal-zero-mean-in-protein-arrays/1145>\
**Category:** Q&A\
**Created:** [January 19, 2022, 2:25am UTC](https://forum.depmap.org/t/what-does-raap-equal-zero-mean-in-protein-arrays/1145 "2022-01-19T02:25:31Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![zhou](https://avatars.discourse-cdn.com/v4/letter/z/3e96dc/32.png) [@zhou](https://forum.depmap.org/u/zhou)\
**Post date:** [January 19, 2022, 2:25am UTC](https://forum.depmap.org/t/what-does-raap-equal-zero-mean-in-protein-arrays/1145/1 "2022-01-19T02:25:31Z")

</div>

What does RAAP equal zero mean in protein arrays? Can RAAP less than zero in cell lines be considered as low expression?

---

<div class="post-metadata">

**Author:** ![jnoorbak](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.depmap.org/jnoorbak/32/12_2.png) [@jnoorbak](https://forum.depmap.org/u/jnoorbak)\
**Post date:** [January 21, 2022, 10:27pm UTC](https://forum.depmap.org/t/what-does-raap-equal-zero-mean-in-protein-arrays/1145/2 "2022-01-21T22:27:17Z")

</div>

Hi, are you looking at protein\_quant\_current\_normalized? I don’t see any RAAP in there. If so perhaps [this post](https://forum.depmap.org/t/protein-expression-data/1065) would answer your question.